package irc

import (
	"strings"
	"fmt"
	"time"
	"strconv"
)

func AppendCallback(slice, data []func(*IRCEvent)) []func(*IRCEvent) {
	l := len(slice)
	if l+len(data) > cap(slice) {
		newSlice := make([]func(*IRCEvent), (l+len(data))*2)
		copy(newSlice, slice)
		slice = newSlice
	}
	slice = slice[0 : l+len(data)]
	for i, c := range data {
		slice[l+i] = c
	}
	return slice
}

func (irc *IRCConnection) AddCallback(eventcode string, callback func(*IRCEvent)) {
	eventcode = strings.ToUpper(eventcode)
	if event, ok := irc.events[eventcode]; ok {
		newevent := make([]func(*IRCEvent), 1)
		newevent[0] = callback
		irc.events[eventcode] = AppendCallback(event, newevent)
	} else {
		event = make([]func(*IRCEvent), 1)
		event[0] = callback
		irc.events[eventcode] = event
	}
}

func (irc *IRCConnection) ReplaceCallback(eventcode string, i int, callback func(*IRCEvent)) {
	eventcode = strings.ToUpper(eventcode)
	if event, ok := irc.events[eventcode]; ok {
		if i < len(event) {
			event[i] = callback
			return
		}
		fmt.Printf("Event found, but no callback found at index %d. Use AddCallback\n", i)
		return
	}
	fmt.Printf("Event not found. Use AddCallBack\n")
}

func (irc *IRCConnection) RunCallbacks(event *IRCEvent) {
	if event.Code == "PRIVMSG" && event.Message[0] == '\x01' {
		event.Code = "CTCP" //Unknown CTCP
		if i := strings.LastIndex(event.Message, "\x01"); i > -1 {
			event.Message = event.Message[1:i]
		}
		if event.Message == "VERSION" {
			event.Code = "CTCP_VERSION"
		} else if event.Message == "TIME" {
			event.Code = "CTCP_TIME"
		} else if event.Message[0:4] == "PING" {
			event.Code = "CTCP_PING"
		} else if event.Message == "USERINFO" {
			event.Code = "CTCP_USERINFO"
		} else if event.Message == "CLIENTINFO" {
			event.Code = "CTCP_CLIENTINFO"
		}
	}
	if callbacks, ok := irc.events[event.Code]; ok {
		for _, callback := range callbacks {
			go callback(event)
		}
	} else {
		fmt.Printf("No callback for: %#v\n", event)
	}
}

func (irc *IRCConnection) setupCallbacks() {
	irc.events = make(map[string][]func(*IRCEvent))

	//Handle ping events
	irc.AddCallback("PING", func(e *IRCEvent) { irc.SendRaw("PONG :" + e.Message) })

	//Version handler
	irc.AddCallback("CTCP_VERSION", func(e *IRCEvent) {
		irc.SendRaw(fmt.Sprintf("NOTICE %s :\x01VERSION %s\x01", e.Nick, VERSION))
	})

	irc.AddCallback("CTCP_USERINFO", func(e *IRCEvent) {
		irc.SendRaw(fmt.Sprintf("NOTICE %s :\x01USERINFO %s\x01", e.Nick, irc.user))
	})

	irc.AddCallback("CTCP_CLIENTINFO", func(e *IRCEvent) {
		irc.SendRaw(fmt.Sprintf("NOTICE %s :\x01CLIENTINFO PING VERSION TIME USERINFO CLIENTINFO\x01", e.Nick))
	})

	irc.AddCallback("CTCP_TIME", func(e *IRCEvent) {
		ltime := time.LocalTime()
		irc.SendRaw(fmt.Sprintf("NOTICE %s :\x01TIME %s\x01", e.Nick, ltime.String()))
	})

	irc.AddCallback("CTCP_PING", func(e *IRCEvent) { irc.SendRaw(fmt.Sprintf("NOTICE %s :\x01%s\x01", e.Nick, e.Message)) })

	irc.AddCallback("437", func(e *IRCEvent) {
		irc.nick = irc.nick + "_"
		irc.SendRaw(fmt.Sprintf("NICK %s", irc.nick))
	})

	irc.AddCallback("433", func(e *IRCEvent) {
		if len(irc.nick) > 8 {
			irc.nick = "_" + irc.nick
		} else {
			irc.nick = irc.nick + "_"
		}
		irc.SendRaw(fmt.Sprintf("NICK %s", irc.nick))
	})

	irc.AddCallback("PONG", func(e *IRCEvent) {
		ns, _ := strconv.Atoi64(e.Message)
		fmt.Printf("Lag: %fs\n", float((time.Nanoseconds()-ns))/1000/1000/1000)
	})
}